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(No Model.) 2 sheetssheet 1.

BT. av D. HIGHAM. EECULATCR'ECE DYNAMC ELECTRIC MACHINES.

No. 362,510. PmntedMay 1o, 11887,.,A

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(No Model.) E 2 sheets-#sheet 2. E. T. an D. HIGHAM.

v REGULATOR ECR DYNAMO ELECTRIC MACHINES. No. 362,510. Patented May 10,1887.

N. PETERS. Pnnla-Lnhog'npher. wnhingmn n. c.

UNITED STATES- PATENT OFFICE.

ENOS T. HIGHAM AND DANIEL HIGHAM, OF PHILADELPHIA, PA.

REGULATOR FOR DYNAlVO-ELECTRIC MACHINES.

SPECIFICATION forming part of Letters Patent No. 352,510, dated Il/Iay10, 1887.

Application llcd June 29,1886. Serial No. 206,574. (No model.)

duction of a constant current in a circuit ofA varying resistance withthe most economical consumption of power in proportion to the work doneby the dynamo.

The object of our invention is to simplify and render more effectivethis regulation of the dynamo and of the motive-power engine; and thisobject we attain by providing between the engine and dynamo-shafts aspringconnection and devices whereby the varying tension of the springs,due to the magnetic retardation of the armature, controls the supply ofmotive fluid to the engine, and devices for compensating for the varyingtension of the springs to maintain the strain practically constant.

In the accompanying drawings we have illustrated the devices which weprefer to use forcarrying our invention into eife'ct.

Figure l is a side view illustrating in eleva-- tion a dynamo-electricmachine and drivingwheel provided with compensating and regulatingdevices whereby the dynamo is caused to govern the motive-power engine.Fig. 2 is a reverse view of the driving-wheel of the engine and of thepulley of the dynamo, taken on a section through the said drivingshaftand the armatureshaft of the dynamo; and Fig. 3 is a vertical section onthe line a; x, Fig. 2.

Our invention may be applied to any construction of -series-wounddynamo-electric machines. In the drawings we have shown only onewcllknown form, for the sake of illustration.

A is the dynamo-electricl machine,andin the present instance we haveshown the armatureshaft as provided with a pulley, B, to be driven by abelt or gear from a wheel, D; but it will be understood that this wheelD may be connected directly to the shaft of the armature. This wheel Dmay be mounted on, but must be free to turn independently of, thedrivingshaft E of the motive-power engine, as itis being theengine-shaft itself, may, however, be v any shaft which is driven fromthe engine.

Keyed or otherwise secured to the shaft E is a two-armed lever, F, theopposite ends ofY which are connected to the wheel or pulley D by meansof a spring, G, the connection of the latter with the levers being suchas to give a compensating leverage for the varying tension or stretch ofthe springs, as hereinafter dcscribed. v

We prefer to provide the springs with suitable adjusting devices at thepoints of connection with the wheel or pulley, as shown in the drawings.

The eccentric H, which, through its strap h and eccentric-rod H',controls the cut-off or other valve of the steam-engine, turbine, orother motive-power engine,ishung by its arm h to a pin,t',on thelever`F,as shown in the drawings. This eccentric H has a slot, c,through which the drivingshaft E freely passes. At right angles, ornearly so, to the slot e is an` v other slot, d, in which works a pin,el', carried by the wheel or pulley D. In the present case we have shownthis pin d as passing freely through a curved slot in one arm of thelevel' F, simply because the relative positions of the parts shown inthe drawings has necessitated it.

The means we prefer to provide for compensating for increasing anddecreasing the tension of the springs, due to the varying stretch ofthelatter, consist in the construction of the lever F so that the pointsof connection of the springs with the two arms of the lever D will benearer to or farther away from the fulcrum or center of the latter asthe tension of the springs increases or diminishes.

. As shown in Figs. l and 2, the end of each spring is connected to theextreme end of each arm of the lever F by means of a iexible butinelastic strap, g, and each arm of thelever is formed with a curvedface, f, of the character illustrated in the drawings, so that as thechanging relative positions of the wheel or pulley and the lever F varythe stretch of the springs the leverage of the lever F willcorrespondingly vary, as illustrated in Figs. l and 2.

In Fig. 1 the springs are shown stretched to their full extent and theleverage correspond- IOO ingly reduced, while in Fie. 2 the springs areshown nnstretched and the leverage correspondingly increased. lt willthus be seen that the curved faces can be so shaped as to give a uniformpull of the springs on the wheel, no matter what may be the position ofthe lever F. In other words, the pull exerted by the springs between thedriving-shaft of the engine and the shaft of the armature is by themeans described rendered uniform at all times.

The operation of the abovc-described devices is as follows: Suppose thedynamo to be adapt ed for supplying current for a circuit of fortyelectric arc lamps, and suppose it to be running with twenty7 of thelights in circuit. The relative positions of the lever F and pulley ofthe regulating device will be toward that shown in Fig. l and theeccentric will be in a position to work the cnt-off to supply acorrespondingly-small amount ot' steam. The magnetic retarding effect ofthe poles of the dynamo on the armature will be balanced by the effective exertion of the springs G. lf, now, the twenty additional lights bethrown into circuit, the first effect in the dynamo-circuit will be aIreduced current, and consequently the magnetic retardation of thearmature will be diminished and the load on the motive-power enginedecreased. At the regulating device the effect of this reduction ofengine-load will be the contraction of the springs G and consequentcorresponding increase in the throw ot' the eccentric, as shown in Fig.2, to supply a greater amount of motive fluid to the engine. The speedof the engine and of the dynamo-armaturc will thus be increased untilthe current in the dynamo-circuit is increased to the normal point andthe magnetic retardation of the armature is again increased inconsequence to equal the tension of thesprings of the regulating device.rlhus it will he seen that as the pull of the springs between the shaftE and the periphery of the wheel l) is constant in its differentpositions the magnetic retardation of the armatnremust also be con stantunder its different spceis, and, as the magnetic retardation of thearmature is the result of the current, the current Inustbe constant.

Vire claim as our invcntionl. The combination of the dynamo shaft andengine-shaft and a spring-connection between the two, and devicescontrolling the supply of motive fluid to the engine, with a compensatorfor the springs, substantially as and for the purpose set forth.

2. The combination of a dynaino-elcctric machine and driving-shaft witha lever fast to the shaft, a wheel loose from the shaft, and springsconnected at one end to the wheel and having at the other ond aconnection with the lever, varying the leverage of the latter inproportion to the varying tension of the springs, substantially as setforth.

3. The combination of a dynamo-electric machine and driving-shaft with alever Vfast to the shaft, a wheel loosey from the shaft, an eccentriccontrollcd by the wheel and lever to operate the valve of themotive'powcr engine, and sp rings connected at one end to thcwhcel andhaving at the other end a connection with the lever, varying theleverage. of the latter in proportion to the varying tension of thesprings, substantially as set forth.

4. The combination of a dynamoclectric machine and driving-shaft withthe wheel loose on the shaft, a lever fast thereto and hav ing inclinedbearing-faces, with an eccentric operated by thc wheel to control theenginevalve, and springs connected to the wheel and having astrap-connection with the inclined faces of thelcver, all substantiallyas specified.

In testimony whereof we have signed our names to this specification inthe presence of two subscribing witnesses.

ENOS T. HlGllAM l) A N l1 E L lzl IG Il AM.

Vitnesscs:

.Tosnrir Il. KLEIN, Ham-:Y SMITH.

Lio

